A plumber who provides a quote without having seen the bathroom, a facade contractor who quotes a price over the phone without knowing the area to be treated: we have all encountered this type of situation. Choosing a craftsman for renovation work is not just about comparing prices. The difficulty lies in the concrete verification of what a professional can do, what they cover in case of a problem, and what their quote really states.
Telemarketing and energy renovation: a legal alert signal
Since August 11, 2026, the telemarketing regime has been tightened. The Bloctel system has been replaced by a mechanism that requires prior consent from the consumer. For energy-saving or renewable energy works, the ban on unsolicited marketing has been in effect since 2020.
A contract signed following illegal telemarketing is automatically null and void. Fines can reach 75,000 euros for an individual and 375,000 euros for a company. A simple rule to remember: any craftsman who calls you without prior request for energy renovation is breaking the law.
This is not an administrative detail. Frauds related to energy renovation have exploded in recent years, becoming a government priority with increased controls. By cross-referencing feedback published on avisdetravaux.fr with the verification of official qualifications, a significant portion of dubious profiles can already be filtered out.
Verification of SIRET number and insurance: the basics before any quote
Before even discussing the budget, two things must be checked. First, the SIRET number of the company. It confirms that the structure exists legally and is registered. Without a valid SIRET, there is no recourse possible in case of a dispute.
Next, the insurance certificates. Two documents are important:
- The ten-year guarantee certificate, which covers damages compromising the solidity of the work or making it unsuitable for its purpose for ten years after the completion of the work.
- The professional civil liability certificate, which covers damages caused to third parties during the construction (water damage to a neighbor, accidental breakage).
- If applicable, the perfect completion guarantee, valid for one year, which obliges the craftsman to correct any defects reported after completion.
These documents should be requested before signing. A serious professional will provide them without delay. Any hesitation or promise of later sending should raise a red flag.
RGE certification and specific qualifications: what they really guarantee
The RGE (Recognized Guarantor of the Environment) mention has become a must for energy renovation work that qualifies for public aid. An RGE craftsman has passed a skills audit and commits to adhering to a technical specifications document.
There are more specific qualifications depending on the type of project: Qualibois for wood appliances, Qualisol for solar thermal, Qualipac for heat pumps. Each qualification corresponds to a precise technical scope, not to a general skill.
Feedback varies on this point: some non-labeled craftsmen work very well, but without an RGE label, the client loses access to financial aid. This is a decision to be made with full knowledge of the facts. The validity of an RGE certification can be checked directly on the public service directory FAIRE.
Subcontracting and RGE label: a common blind spot
A recent tightening of the rules governs subcontracting in RGE projects. The company holding the contract must itself hold the certification for the relevant work. If the installation is delegated to a non-certified subcontractor, the aids may be canceled and the project reclassified.
The question should be asked clearly during the first meeting: who is physically working on the site, and does this person hold the corresponding qualification.
Reading the work quote: the lines that reveal the seriousness of a craftsman
A renovation quote is not a simple price estimate. It is a contractual document. Several elements allow distinguishing a reliable quote from a sloppy document.
The complete contact details of the company must appear at the top: company name, address, SIRET, VAT number, share capital. The absence of any of these elements is a breach of legal obligations.
Each service must appear on a separate line, with a precise designation of materials (brand, reference, technical characteristics), quantities, unit prices, and labor costs. A quote that groups everything into a single global line prevents any comparison and any dispute in case of poor workmanship.
The estimated duration of the project, payment conditions (deposit, deadlines), and any late penalties complete a well-constructed quote. We compare at least three quotes for the same project, not to find the cheapest, but to identify any abnormal discrepancies in the details of the services.
Preliminary technical visit: a non-negotiable criterion
A craftsman who sends a quote without having visited the site cannot provide an accurate estimate. The visit allows for taking measurements, assessing the condition of the existing support, and identifying access or structural constraints. A quote based on photos sent via message always carries a risk of significant deviation from the reality of the site.
The choice of a craftsman for a renovation project is based on concrete verifications, not on an impression. SIRET, insurance, qualification, detailed quote, site visit: each step eliminates a risk. A professional who meets these criteria without hesitation is, in the vast majority of cases, the one who will complete the project correctly.
